Let me unconfuse you. Look into the subdirectories of your filesystem: /usr/lib/perl5/vendor_perl /usr/lib/python*/site-packages /usr/lib64/ruby/ge

Let me unconfuse you. Look into the subdirectories of your filesystem: /usr/lib/perl5/vendor_perl /usr/lib/python*/site-packages /usr/lib64/ruby/gems/*/gems /usr/lib64/node_modules You have only one version of each library. This is the exact opposite of DLL hell.